HI EVERYONE MY NAME IS JOE, I AM NEW TO THE SITE, I OWN AN OLD CRAFTSMAN TRACTOR MODEL # 917.257572 WITH A 15 HP OHV BRIGGS ENGINE. I WAS HAVING A PROBLEM STARTING IT, AFTER READING ALL THE POSTS ON YOUR SITE, I DETERMINED THAT THE VALVES NEEDED ADJUSTING, AFTER DOING THAT IT WAS STILL STRUGGLING TO START, I ORDERED A NEW STARTER AND THAT DID THE TRICK, IT STARTS LIKE NEW. THIS SITE IS AMAZING, I WAS ABLE TO EASILY FIGURE OUT THE PROBLEM. KEEP UP THE GREAT WORK AND THANKS FOR YOUR HELP.